Abstract:
A viewing glass used through which measurements are displayed which comprises a groove (5) having a shape parallel to the movement of an indicator needle. Displaceable markers are placed in the groove in order to denote the limiting positions of the measurements being made.
Abstract:
A method suitable for preparing a specimen for inspection, the method comprising the steps of: irradiating a photocathode so that the photocathode emits electrons from a surface of the photocathode, wherein the emitted electrons each follow a trajectory, and the trajectories of the electrons are such that they can be extrapolated to intersect at a region within the photocathode, the region defining a virtual source, and wherein the photocathode comprises a rounded tip which has a radius of curvature; configuring the emitted electrons so that they form an electron beam; focusing the electron beam onto a specimen to form an image of the virtual source on the specimen. There is further provided a corresponding electron beam apparatus.
Abstract:
A method suitable for preparing a specimen for inspection, the method comprising the steps of: irradiating a photocathode so that the photocathode emits electrons from a surface of the photocathode, wherein the emitted electrons each follow a trajectory, and the trajectories of the electrons are such that they can be extrapolated to intersect at a region within the photocathode, the region defining a virtual source, and wherein the photocathode comprises a rounded tip which has a radius of curvature; configuring the emitted electrons so that they form an electron beam; focusing the electron beam onto a specimen to form an image of the virtual source on the specimen. There is further provided a corresponding electron beam apparatus.
Abstract:
A microcomparator for elevation measurements having an amplification mechanism (3) which consists of a lever (31), the lever transforming the linear movement of a feeler (5) into a circular movement, and a lever arm (32) formed at least partly by calibrated rods (36) juxtaposed parallel to each other. The feeler (5) engages one of the calibrated cylinders (36) in accordance with the desired amplification factor without requiring altering the zero set for each change of scale. The amplification mechanism (3) and the display means (4) are fixedly connected with a carriage rotatably mounted on the housing (1) allowing a zero setting in such a manner that the display means always shows the same zero point as a function of the carriage (2). The microcomparator may also contain an automatic device for taking off measurements and a window containing a groove in which tolerance indicators may be carried.